> The best counter argument for this would be a list of methods in List that
> are inappropriate for Element. The obvious one is add - once you get the
> underlying list, it would not be hard to add something like an output
> stream.
Elliotte has proposed that PartialList sanity check object types. It's
a technically reasonable proposal. I'm adding it to TODO.txt. (It's
another sanity check we may want to skip in certain circumstances.)
-jh-